Parameter Question

hi all,

quick question on i've come across recently. in example below( , in other similar ones), 'computername' parameter has been set being fed '$computername.' after testing, noticed script work if use '$computername,' '$computer,' , '$computers' values parameter, nothing else. assuming latter 2 work because hold values(although, not sure how or why $computers works, since foreach enumerating it); why $computername works, not sure. i'm guessing there built in functionality when declare parameter, when use name value, represents whatever current value gets placed there?

i'm not being confusing :) code below:

$computers = 'testbox1' , 'testbox2' , 'testbox3'

function rebootwork {
param([string]$computername)
foreach($computer in $computers) {
get-wmiobject win32_operatingsystem -computer $computername |
invoke-wmimethod -name reboot | out-null
}
}
rebootwork -computername $computers

perhaps changing variable names will make less confusing

$computers = 'testbox1' , 'testbox2' , 'testbox3'   function rebootwork {  param([array]$sausage)  foreach($watermellon in $sausage) {     $watermellon
 #get-wmiobject win32_operatingsystem -computer $watermellon |  #invoke-wmimethod -name reboot | out-null  }  $computers  }    rebootwork -sausage $computers

within function:

$sausage contains array of computers defined in $computers

in foreeach loop, each individual element of $sausage assigned $watermellon

get-wmiobject win32_operatingsystem -computer $computername

 in new powershell session, $computername return nothing, because it's not defined anywhere... i'm guessing in environment $computername defined somewhere, script perhaps? profile?

in case of example, use:

get-wmiobject win32_operatingsystem -computer $watermellon

the result:

testbox1 testbox2 testbox3 testbox1 testbox2 testbox3 

you computer names once each foreach loop

then again, because $computers returns $computers array defined @ beginning of script.

i hope clears little?

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admiral ackbar says...

Windows Server  >  Windows PowerShell